<?php
namespace Api\Provider\Admin;

use Api\Provider\IndexProvider;
use Api\Service\UserService;


class OssProvider extends IndexProvider
{
    private function gmt_iso8601($time) {
        $dtStr = date("c", $time);
        $mydatetime = new \DateTime($dtStr);
        $expiration = $mydatetime->format(\DateTime::ISO8601);
        $pos = strpos($expiration, '+');
        $expiration = substr($expiration, 0, $pos);
        return $expiration."Z";
    }
    
    public function get($param){
        if (empty($param['bucket']) || empty($param['uid']) || empty($param['id'])) {
            $this->fail(600);
        }
        $id= C('OSS.accessKeyId');
        $key= C('OSS.accessKeySecret');
        
        $now = time();
        $expire = 30; //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问
        $end = $now + $expire;
        $expiration = $this->gmt_iso8601($end);

        $userService = new UserService();
        $unionId = $userService->getUnionId($param['uid']);

        if ($param['bucket'] == 'img') {
            $host = C('OSS.ossDomain')['img'];
            $dir = '/';

        } elseif ($param['bucket'] == 'record') {
            $host = C('OSS.ossDomain')['record'];
            $dir = $unionId.'/'.$param['id'].'/';

        } elseif ($param['bucket'] == 'score-headimg') {
            $host = C('OSS.ossDomain')['score-headimg'];
            $dir = $unionId.'/'.$param['id'].'/';

        } elseif ($param['bucket'] == 'user-sheetimg') {
            $host = C('OSS.ossDomain')['user-sheetimg'];
            $dir = $unionId.'/'.$param['id'].'/';
        }
        
        //最大文件大小.用户可以自己设置
        $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000);
        $conditions[] = $condition;
        
        //表示用户上传的数据,必须是以$dir开始, 不然上传会失败,这一步不是必须项,只是为了安全起见,防止用户通过policy上传到别人的目录
        $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
        $conditions[] = $start;
        
        
        $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
        //echo json_encode($arr);
        //return;
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);
        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));
        
        $response = array();
        $response['accessid'] = $id;
        $response['host'] = $host;
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
        $response['expire'] = $end;
        //这个参数是设置用户上传指定的前缀
        $response['dir'] = $dir;
        $this->success($response);
    }
}

